Means for molding manhole frames



Aug. 17 1926.

E. F. DOOLEY ET AL MEANS FOR MOLDING MANHOLE'FRAMES Filed Feb. 26, 1924 N w w k W M a 1m INVENTOR Z'flwley 218cm d WITNESSES A TTORNEYS Patented Aug. 17, 1926.

UNITED STATE'E PATENT OFFICE.

EDWARD F. DUDLEY AND GRANVILLE B. SCANLAND, F HUTCHINSON, KANSAS, AS-

SIGNORS TO HUTCHINSON FOUNDRY & MACHINE WORKS, OF HUTGHINSON, KAN- SAS, A COPARTNERSHIP COMPOSED OF JOSEPH P. OSULLIVAN, GRANVILLE B. SGANLANID, AND GEORGE W. RUNDELL, ALL OF HUTOHINSON, KANSAS.

MEANS FOR MOLDING MANHOLE FRAMES.

Application filed February 26, 1924. Serial No. 695,289.

Our invention while adapted for use for other purposes is more particularly intended for the molding of manhole frames. Tn molding manhole frames and like articles by methods usually practiced, the molding is rather slow and tedious.

The general object of our invention is to provide a method and means for molding articles such as referred to. whereby the output of the molders is very materially 1ncreased and an improved product assured.

The nature of our invention and its distinguishing advantages will clearly appear as the description proceeds.

Reference is to be had to the accompanying drawings forming a part of this speciflcation, it being understood that the drawings are merely illustrative of one example of the invention.

Figure 1 is a Vertical section of a mold for carrying out our invention showing the mold arranged in the first assemblage thereof, that is to say, before the removal of the separate pattern member from the mold and from the body pattern member;

Figure 2 is a view similar to Figure 1 showing the mold inverted and after the complete removal of the pattern and showing the mold in condition for the pouring of the metal;

Figure 3 is a vertical section of the match board with the cope cover ring thereon preliminary to the placing of said cope cover ring on the mold after inversion of the latter to the position of Figure 2;

Figure 4 is a plan view of the cope cover ring before the ramming of the sand therein.

Referring to the parts of our improved mold, the numeral 10 indicates the flask having outwardly directed top and bottom flanges 11. 12 indicates the bottom board which is placed on top of the mold before inverting to bring the bottom board to the normal position of Figure 2. 13 indicates the follow board; 14, a cast iron cover ring, the purpose of which will be explained; 15 indicates the cope cover ring; and 16, a match board having a raised center 17 held in position by dowel pins 18 therein entering blind pin holes 19 in the upper surface of the match board 16. The cope cover ring has a single vertical flange 20 at the outer and the pins 23are of less height than the flanges 21 on the cast-iron cover ring 14 and within the plane of said flanges 21.

Our improved pattern is formed of a body ring 24 generally L-shaped in cross section to present a lateral outwardly directed flange 25 a short distance from'one edge of said pattern body to produce an annular member 26 in the general lines of the body and projecting beyond the plane of the flange 25; together with a separate ring element 27 coacting with the body ring or shell like element 24. The separate element 27 is of materially less height than the body of the ring 24 and it is of larger diameter than said body ring to form the pattern for the annular offset member of the molded manhole frame as will appear. In carrying out our invention in practice the flask 10 is placed on the follow'board 13 as in Figure 1 and the pattern consisting of the body ring 24 and the separate ring element 27 are placed in position. The body ring 24 is positioned with its flange 25 and projecting flange member 26 on the follow board and with the main portion of the body ring vertically disposed. The sand is rammed inside the body ring 24 and outside the same and the auxiliary ring 27 is placed in position represented by the showing in Figure 1, the cavity por tion a: being produced by the removal of the element 27. The annular cavity a having been formed by the removal of the ring 27 from the mold, the cast iron cover ring 14 is placed on the sand over the cavity a and below the plane of the top of the flask 10. The plane of the top of the cavity a is at the strike-off line of the mold. Hence, the inverted cast iron cover ring 14 is disposed with the bottom at the plane of the strike-ofl line. Sand is now rammed in the mold over the cover ring 14 and to the level of the top of the flask. The bottom board 12 is now placed in position. The mold now with the cavity a therein and containing the body ring 24; of the pattern as wellas the cover ring 1% is inverted bringing the bottom board 12 to'the bottom of the mold and the follow board 13 at the top. Said follow board 13 is now removed and the pattern ring 2% drawn from the sand. Thus, the cavity (6 produced by the removal of the ring 27 will be complementary to the cavity produced by the removal of the body ring 2 1. Hence, the cavity including that lettered a corresponds with the manhole frame to be molded, the portion a representing the offset top of the manhole frame while the cylindrical body of the frame and the lateral flange on the manhole frame andthe member corresponding with the pattern member 26 will be produced by the pouring of the metal into the cavity produced by the withdrawal of the pattern member. After the removal of the follow board from the top of the mold and the removal of the pattern ring 2 1, the cope cover ring 15 is placed on the flask with its flange resting on the flask 10, the resting of the cope cover ring on the flask preventing crushing of the sand. The cope cover ring 15 is first placed on the match board 16 about the central raised portion 17 thereof and thering 15 is rammed with sand between its flange 20 as an outer wall and the edge of the raised portion 1 1 as the inner wall confining the sand. The ring 15 being thus rammed with sand it is removed from the match board, inverted and placed in position on the flask as in Figure 2 lying over the cavity produced by the lateral flange member of the pattern.

It has been demonstrated in practice that the work of molding manhole frames and like parts is greatly facilitated by the use of our improved mold and the output materially increased. Not only so but a casting much better than those produced by a previous method results.

3y our improved mold and method the usual cope and cheek of the flask are eliminated as are also bottom and top cover cores, because of the use of the iron cover ring 14; and the cope cover ring 15, and the amount of labor in assembling the mold and ramming the same is greatly reduced so that the number of castings produced per workman is practically doubled. Moreover, the metal rings 14;, 15 require only the minimum floor space at any time, and their cost is small. The rings 1 1, 15 function in making castings with two or more projecting rings or flanges such as flanged pipe, drums, pulleys, etc. It will be understood that the pattern rings at and 27 may be round,'square or otherwise as may be desired to produce a particular shape of article.

The rapidity of production of the castings in accordance with our invention is made possible in a foundry not equipped with expensive machinery, such as molding machines, air compressors, electric devices, etc. and the mold, it is to be observed is formed by ramming in the usual way with sand, without aid of backing or side wall plates or like units. t is a characteristic of the castings produced by our method that they are of uniform quality and are produced with anabsence of joints in the pattern, thereby eliminating the possibility of failure due to imperfect assembling of j ointed units.

\Ve would state in conclusion that while the illustrated example constitutes a practical embodiment of our invention, we do not limit ourselves strictly to the exact details herein illustrated, since, manifestly, the same can be considerably varied without departure from the spirit of the invention as defined in the appended claims.

Having thus described our invention, we claim 1. In a mold of the class described, a flask adapted to receive a pattern and sand, a cover ring adapted to be disposed within the flask and cover one end of the cavity formed by the removal of the pattern, and a cope cover ring adapted to be positioned adjacentthe opposite end of the mold from the first ring and to lie over the opposite end of the cavity formed by the removal of the pattern.

2. In a mold of the character described, a flask adapted for receiving a pattern and sand for packing said pattern within the flask, an outwardly extending flange at one end of the pattern providing a similar cavity or depression in the sand when the pattern is removed from the flask, a cope cover ring adapted to seat upon one end of the flask and serve as a covering for said cavity or depression formed by the flange upon the pattern, and pins protruding from the inner face of the cope cover ring adapted to hold sand.

In a mold of the class described, a flask adapted to receive a pattern and sand, and a cope cover ring of a size to rest at its outer portion on said flask at an end ofthe latter; together with a cover ring of less diameter than the cope cover ring and adapted to be positioned in the mold adjacent the opposite end from the cope cover ring to form a closure for the adjacent end of the cavity produced in the sand by the removal of the pattern.

GRANVILLE B. SV-GANLAND. EDWARD r. DOOLEY. 

